A method and tips for installing exterior rigid foam on a roof to minimize thermal bridging through the rafters.
Frugal Happy: Giant Foam Box, Part 2 - GreenBuildingAdvisor
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Unvented roof assembly at eave retrofitted with rigid foam, spray
Exterior tapered insulation retrofit for low-sloped roof. 1.2/12 to 4/12 pitch - GreenBuildingAdvisor
Retrofitting Foam Insulation on a Roof - Fine Homebuilding